Improvement in machines for swaging screw-threads on bolt and screw blanks



Patented lune l-7. 1873.

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Blanks.

n1 B o E K L E N gingV Screw-Threads on Bolt and Screw-AMPHoro-L/HQGRAPH/c m (osoR/vn's Pnacfss) `Machines for Swa UNITEDSTATES APATENT GFFICE.

REINHOLD BOEKLEN, OF NEW YORK, N. Y.

IMPROVEMENT IN MACHINES FOR SWAGING SCREW-THREADS 0N BOLT AND SCREWBLANKS.

Specification forming part of Letters Patent No. 139,861, dated June17", 18743'; application led October 2, 1872.

To all 'whom it may concern:

Be it known that I, REINHOLD BOEKLEN, of New York, in the county of NewYork and State. of New York, have invented certain new and usefulImprovementsin Machines for Rolling Screw-Threads on Metal and I dohereby declare that the following is a full, clear, and exactdescription thereof that will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to an improvement in machines for rollingscrew-threads on metal rods where required; and consists in combining,with a vibrating and one or two stationary dies, a crank movement, andiuconnecting with the vibrating die one or more annular iianges andconnecting mechanism, as herein after more fully described and pointedout by the claim. j

Figure 1 represents a side elevation of a machine embodying myinvention. Fig. 2 is a partial transverse vertical section. Fig. 3 is alongitudinal section through center of die D 5 and Fig. 4 is alongitudinal section of a modification.

A represents the bed piece which supports the frame or stand B, whichmay be of any suitable or desired construction. O C represent thestationary dies which are secured to the stand or frame B, which may bearranged to be adjusted by set-screws in the ordinary manner. vDrepresents the vibrating die, which is supported upon the shaft E, andhas screw-threaded surfaces corresponding to those upon the face of thestationary dies for cutting threads. E represents the shaft upon whichthe vibrating die is mounted. Said shaft has abearing in the frame orstand A, with another suitable bearing, as shown in dotted lines, Fig.4. F represents a crank, by which motion is imparted to the vibratingdie through the shaft E. Grepresents a connecting-rod or pitman,connected with the crank F. H represents the 'hopper through which theblanks are fed and regulated in proper position by the arms I. Jrepresents Vtw'o springs coiled around shaft E in opposite d1- rections,one end of each of these 'springs being attacheditol the stud K,securedupon the inside of the `guide L 5 the object of the springs being tothrow the vibrating die `D to its normal position and allow the guide toyield to the" motions of the blank between the dies. The outer surfaceof the guide L is provided with annular flanges c c, which may beadjustable to correspond to thehead'of the bolt or screw, and receivethe same, as shown in Fig. 2. y,

The blanks are fed from the hopper H,

one by one, into one of the pockets a. The

die D is then `vibrated, the blank passing between the said die and oneof the dies (l, and the thread isby this means formed upon the blank,and the same is discharged at the point b. When the die Dis in positionto discharge a screw from one of its pockets', the

other pocket is brought .directly under the hopper H and receives ablank which is to bc threaded by the .opposite die as the die D isbrought back to its iirst position; thus a blank is threaded by everyalternate motion of the vibrating die D. The distance between thepockets a a is equal, or nearly equal, to the crank F and die D remainsuihciently still i for an instant for thepocket to receive the blankfrom the hopper, then at the beginning of the return stroke oi' thepiston-rod the mo tion of crank F and die D is at first slow and thengradually increases, thus bringing the blanks between the dies slowly,and by a gradually-increasing speed. This prevents the machinery frombeing broken, as heretofore, where cogs or `belts were `used and theblank brought suddenlybetween ,the dies, and especially in the -use `ofcogs where the slack or space betweenthe cogs causes a jerk! ing motionof the moving die as the blank is brought between the dies.

The modification shown inFig. 4 embodies the same principle as thatabove described, and is operated by the saine means. The modiiicationconsists simply in setting the dies C C beneath the die D, with theirlower ends nearly meeting below, leaving a dischargeopening, a directlyunder the die D. By doing this it will necessitate the use of twoheppers, H Hf, one being placed at the top of each of the stationarydies C C. With these exceptions the operation and construction is thesame as the machine above described.

There may be another guide, L, placed upon the4 opposite side of thevibrating die, and the dies made sufficiently wide to cut two bolts atYthe same time, but this I consider simply a duplication of what is shownand described.

Having thusfully described my invention, what I claim7 and desire tosecure by Letters Patent7 is- 1. The stationary die or dies C C, andvibrating die D, provided with the guide L, the die D being operated bya crank movement directly from the rod G, substantially as and for thepurpose herein specied.

2. The guide L and annular ilanges c c, in combination with the springsJ, hopper H, and dies D C C, substantially as and for the purpose setforth.

3. The annular guide L, with pockets a, in combination with the hopperH, when constructed as described and for the purpose specified.

a. BOEKLEN.

Witnesses J Aivras H. GRIDLEY, SoLoN O. KEMON.

